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I do not have electricity (except 12V. solar) in the greenhouse. Standard temps from late May thru Sept is mid 90s here in North Florida. Greenhouse goes over 100 most of the afternoon)

I'm considering running misters on a timer (a 12V solution); Getting a couple of 12V fans from the junkyard (another 12 V that would require another battery/solar panel, etc). or getting a couple of "wind turbines and cutting holes in the plastic to let the heat out.

Do any of you guys or girls have experiences with these methods, or perhaps have a better solution? I'm all ears...

Both ends of the greenhouse are open, and the side plastic is rolled up for the summertime Just the top is covered in plastic, but its still VERY hot in there. My tomato production is way down. Flowering, but not producing little toms.

The house is 12 wide X 40 long X 8 ft tall hoop house, with 16 ft cattle panels making the hoop. The shade cloth is laid over the panels and plastic over the shade cloth. I have a steel pipe running down the middle at the peak which supports the tomatoes (on string). It has withstood a couple of very strong topical storms already, but there is no other bracing in the house.

Short of cutting holes in it, it sounds like fans must be the answer... you already have vented the sides and are using shade cloth, but the top is still trapping heat. The ends should be vented right to the top, and install your fan up there to blow fresh air through the top so heat isn't trapped.

Being in Florida, a solar powered fan would be the obvious solution to no electric on site.

hmmmm..... if your outside temp is 90 and your gh only gets to a hundy, that's not too shabby. my gh is storage during may-October, as it can get 180 up in there on a 90 degree day - and that is with cross ventilation (door wide open & 2'x2' window open).

I have a fan and 120v, but pffffffftttt doesn't seem to help much. shade cloth does help - some - but probably need something from nasa if gets west sun. NoFlo can be brutal despite the "north" being in the name & sticky too.

a pic would be helpful, but have to ask why you are in the gh anyways, unless you plan on running some ac up in there.

I use aluminet. too. it really does work better. we wiggle wire it right to the high tunnel. sell your tomatoes to pay for the stuff if it is too costly to pay for out of pocket. if you go more than 50% shade you will get NO tomatoes. they won't blossom. the screening from lowes... does it tell what the percentage is? if not I wouldn't take my chances on trying it.